.picture{
    width: 340px;
    height: 340px;
    background-image: url(./image/地球.jpg);
    position: relative;
    animation: run 12s linear infinite;
}
@keyframes run{
    from{transform: rotate(360deg);}
    to{transform: rotate(0deg);}
}
.picture:hover{
    animation-play-state: paused;
}